Direct nanoscale observation of zeolite framework dynamics during bioethanol dehydration catalysis

Resumo

Zeolites are key materials in heterogeneous catalysis and separation processes due to their well-defined microporous structures. However, despite extensive studies, fundamental questions remain regarding molecular adsorption and diffusion within their nanoporous frameworks. Notably, the intrinsic framework flexibility of zeolites is increasingly recognized as a critical factor influencing their adsorption, diffusion, and catalytic behavior. In this work, we employ in situ time-resolved Bragg coherent X-ray diffraction imaging to directly visualize the nanoscale lattice dynamics of zeolite crystals under catalytic conditions. By monitoring the evolution of crystal lattice deformations during ethanol dehydration reaction, we aim to uncover how zeolite frameworks respond to molecular confinement and reaction environments. Gaining insights into these dynamic structural responses is crucial to advancing the rational design of zeolites with enhanced adsorption capacities and catalytic selectivities.